Continuous process of decolorizing lubricating oil



w. P. GEE

Aug. 10, 1943.

CONTINUOUS PROCESS OF DECOLORIZING LUBRICATING OIL Filed Sept. 26. 1939 2 Sheets-Sheet 1 uDEnu 1 E0400 INVENTOR' 10% SW M.

ATTQ'RNEYS WILLIAM P. GEE

EMPJE Ii-Ill Aug. 10, 1943. w. P. GEE 2,326,294

CONTINUOUS PROCESS OF DECOLORIZING LUBRICATING OIL Filed Sept. 26, 1939 -2 Sheets-Sheet 2' CLAY CAKE CONVEYOR COOLER APoRAToR I & COOLER .WIL LIAM P. G2:

F IG. 2

TANK

STORAGE NAPHTHA ATTORN s K -gVENTOR sure regulator i? in order to maintain a constant blow-back pressure. Inert gas may be suppl ed v to the system from a gasometer or other extraneous source, which is connected. to a balance line communicating with the hood of the'filter.

fIfhe' filtrate from through a pipe l receiversBi 'and' I2 is pumped 8 toa continuousdistillation-unit assess; Y 1 u Q In the still 42 the solvent,i. eQketone, ketones naphtha is distilled from the coloring matter which remains behind as residue.- The recovered solvent is subsequently returned to the solvent IS. "The naphtha recovered injthis unittislre .turned to the storage tank 3; while the residue,

comprising recovered oil, may be pumped to oil storageaor returned for recycling through the contact plant. Y I 5 '1 The ideoiled filter cake containingnaphtha is conveyed'by the scroll conveyor 16 into; a repulp" tank 26 where itis mixed with acolor-rernoval tank 2| through" a" heater- 22 and"pip'e"2 3 mule tank 26." jThG SOlVBIltiS rnixedwith'the clay'in'.

V tinklifidform a' mixture 'containing aboutle to 3Q%"by' Weight offc1ay;lThe mixing is advan tageously eflected at 'a temperature above nor- "The r'epulpftank to is seamen-toy ot sufli ,g Fig.;2 illustratesa modification of the forego 7 ing process asp-employed in direct conjunction solvent such as'acetonermethyl 'ethyl ketone' and s the like, or mixtures ofthese with naphthaj.-,For example, a suitable mixture of 'kejton'e and-naph tha may containaround to 30% by.volume' I ot ketone This solvent is pumped-frame; supply 7 supply tank 2 l, while'the residue of coloring matter is withdrawn and may be disposed of'as fuel.

ortutillized'insorne other-manner: :Thedry recovered charged therefrom byj-introducing a blow-back l0- V I I the cake dropped into the bottom of the filter *Qfromtvvhich it is conveyed'to a hopper for re- ;ofdow pressure inert gas through a pipe and usein the treatment of oil. Y

stock; V 1 e and introduced to a mechanically agitated tank 50. QI 'tLto this'ta'nk alsofilows naphtha' lade n recoveredfineclay from-'aiconveyof'l'.The flow ofthe-charge oil is p proportion. of decoloriz'ing clay tooilis obtained so regulated that: the proper inthistank;

'The resultiicg mixtureis pumped by a pumps:

teinperature isfraised'tc the'proper degree for I contacting; for example, in the order of AGO-500* ,"Thefmikt'ure of "clayand solvent isp assedf throughipipe 4 to apressurej f lter'25 whichmay T In' orjderlto obtain evencakeiormation and best lnenced' by having; valve 29 invthe recirculating V p the filter isire'cir'culated through the filter backi Itothe repulpw tank 28," Valve 28 is closed slowly;

- akethicknessiisfQrm$d;if0r.exa l e es;

ingpr'essurem a'y not'exceed'flllipounds pe' 'quare 7 inch. This (maximum jfpre'ssure is niaintai'nedbnithef filter atthe endof the 'cake- ,li n Q3 U entirelyjOpen softhatthe charge entering ,'a'nd pi'ssurejgradually built up untilthe desired iorn ing period bygintroducinghigh pressure inert' inoval solv' fit fis displaced iromithe cake "by in-t l troduci ng naphtha} to the filter through. fa; pipe 7 35 j communic'ating with the s'upply' tank};

rnemam filtrate, as w ras that obtained o r;

IT 'ejaftei steam" is introduced to the filter throug- 'afp'ipeefliforthe purpose of recovering t e naphtha retained in thecake. 3 Th,e steamings arepas sedidllt offthe filter through a pipe 39 and through afco'oler' lfi to a tankorfdec'anter M, H

' s jthefs olvent; liquid from T the receiver 31,,

- 1' sjsumpeetoastn izi t The water layer from the decanter ti s wit I drawn through af'pipe 1'43 "and, may be' subjected to a ,distilling Or fr'aQtionating ope U r I rationlfor, the purpose ofr'ecoveringthe keto'rie; J

y flhefnaphthailayer' from this decanter tank, as j 3 Ffwhn ahigh viscosityoil such-as cylinder stock 7 is beilig reated.-

" The 5 hot 'Qili and "cla'y 'rnixture {front the eater flows into an evaporator; 55,: Whe'rein the naphtha v content oljthe mixture which: was introduced- 7 i p p g V 35 w th cwer d ej filtiing" results, formationof the cake is come forcedftlirough meets to 'atank' so; a

flk'iejjQO lerfreduces'the cljy oil mixture-"to' such af teniperature that n'aph'tha'canbe intro-- oueec rror the tank? it through pipes B i am e-2' 1 to; :the' tank fSG jvvithout' excessive,evaporatieni V s rarlwest in cojnect gpsuch-a previously; described in.

to displace retained 'cclor reniovalsolvefitz' The recovered naphtha laden clay. cake is' dis ged iroihthe filterithrou'glrthe conveyor'fil, p QVl U$ Y e e d ft v 7 into the tank; 58.

a): the' invention; as hereihbefo rie se't' for t h niay claycake inthemt r is disf he'lubricatingioil'stock ,i.such as asolvent exg; jitractedfoil; is conducted from a source not shown 7 7 av isflash evaporated. The 1 vaporized fnaphthafj is dIHIW IIflOfl througha condenser' 56" ridf after cpndensation andwcool ma a ed i'q 7. Q

clay-oil mixture passes *over "menace within the evaporator ---to facilitate r, p -a'nd-to avoid 's'ettlingfcut'ot-the1 lay ironijthe oil p d oilf mixture is withdrawn from the ammer; the evaporator bya purnp" 58"a:nd

a fpr oat, The 'oil solutionisr' v is sub equently' evaporated from; the =deco1orizedsitu withi n -phth'a' and which discharges 

